Seasonal significance of new particle formation impacts on cloud condensation nuclei at a mountaintop location
Seasonal significance of new particle formation impacts on cloud condensation nuclei at a mountaintop location
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DOI：
10.5194/acp-22-15909-2022
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发表时间：
2022-12
影响因子：
6.3
通讯作者：
Noah S. Hirshorn;Lauren M. Zuromski;Christopher N. Rapp;I. McCubbin;Gerardo Carrillo-Cardenas;F. Yu;A. Hallar
中科院分区：
文献类型：
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作者：
Noah S. Hirshorn;Lauren M. Zuromski;Christopher N. Rapp;I. McCubbin;Gerardo Carrillo-Cardenas;F. Yu;A. Hallar
抽象。新粒子形成（NPF）事件被定义为气溶胶的突然爆发，然后增长，并可以通过增长到更大的尺寸和在适当的条件下影响气候，可能形成云凝结核（CCN）。有关NPF和CCN的实地测量对于扩大区域对气溶胶如何影响气候的理解至关重要。为了量化NPF对CCN形成的可能影响，在对NPF事件进行分类时不仅要保持一致性，而且还要考虑颗粒生长到CCN相关尺寸的适当时间框架。在这里，我们分析了15年的直接测量的气溶胶粒径分布和CCN浓度和联合收割机，他们与新的方法来量化的NPF对CCN形成的影响风暴峰实验室（SPL），一个远程，山顶天文台在科罗拉多。使用新的自动方法对NPF进行分类，我们发现从2006年到2021年，NPF发生在研究中考虑的所有天数的50%，这与SPL以前的工作一致。NPF显着增强CCN在冬季的一个因素的1.36，在春季的一个因素的1.54，这与以前的工作相结合时，在SPL，这表明增强CCN NPF发生在区域尺度上。我们证实，持续增长的事件是常见的春季和冬季，而突发事件是更常见的夏季和秋季。在本研究中对自动方法进行了目视验证。研究结果第一次清楚地表明了NPF对北美山地地区CCN的重大影响，以及NPF对CCN的广泛影响的潜力。
Abstract. New particle formation (NPF) events are defined as a sudden burst of aerosols followed by growth and can impact climate by growing to larger sizes and under proper conditions, potentially forming cloud condensation nuclei (CCN). Field measurements relating NPF and CCN are crucial in expanding regional understanding of how aerosols impact climate. To quantify the possible impact of NPF on CCN formation, it is important to not only maintain consistency when classifying NPF events but also consider the proper timeframe for particle growth to CCN-relevant sizes. Here, we analyze 15 years of direct measurements of both aerosol size distributions and CCN concentrations and combine them with novel methods to quantify the impact of NPF on CCN formation at Storm Peak Laboratory (SPL), a remote, mountaintop observatory in Colorado. Using the new automatic method to classify NPF, we find that NPF occurs on 50 % of all days considered in the study from 2006 to 2021, demonstrating consistency with previous work at SPL. NPF significantly enhances CCN during the winter by a factor of 1.36 and during the spring by a factor of 1.54, which, when combined with previous work at SPL, suggests the enhancement of CCN by NPF occurs on a regional scale. We confirm that events with persistent growth are common in the spring and winter, while burst events are more common in the summer and fall. A visual validation of the automatic method was performed in the study. For the first time, results clearly demonstrate the significant impact of NPF on CCN in montane North American regions and the potential for widespread impact of NPF on CCN.